Yes. At least, with the system Upload I think only in the server side.Don't have any example, but when you reach server (button has to be submit to the file to be sent), you can check the Upload in the server, as the properties like the File Content and the File name are available, and you than can check if the file name finishes with ".xlsx" and proceed accordingly.

Yes. At least, with the system Upload I think only in the server side.Don't have any example, but when you reach server (button has to be submit to the file to be sent), you can check the Upload in the server, as the properties like the File Content and the File name are available, and you than can check if the file name finishes with ".xlsx" and proceed accordingly.